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Title

Differential ecophysiological responses of the toxic species Ostreopsis cf. ovata and Prorocentrum lima to water motion

AuthorsVila, Magda ; Giussani, Valentina; Viure Feliu, Laia ; Alechaga, Élida; Moyano, Encarnación; Hernández-Llamas, Soraya; Berdalet, Elisa
Issue Date10-Oct-2016
CitationICHA : The 17th International Conference on Harmful Algae : Abstract Book: 182 (2016)
AbstractHydrodynamism modulates marine microalgae dynamics at different scales. However, the understanding of the mechanisms of action of this key abiotic factor has still many uncertainties. Field observations suggest that water motion and wave action could play a selective role on the spatial distribution, ecology and physiology of some harmful epiphytic species. In order to shed light to this subject at physiological scale, laboratory experiments were performed with Ostreopsis cf. ovata and Prorocentrum lima. Strains of these species isolated from the same NW Mediterranean site were exposed during 3 weeks to the turbulent motion generated by an orbital shaker at 50 rpm with a 0 - 10º angle inclination variability range, a motion similar to that observed in their natural habitat. P. lima grew exponentially for almost 4 weeks, with similar growth rates (0.18 d-1) and final yield (12000 cells·ml-1) under the two experimental regimes. Under still conditions, O. cf. ovata exponential phase lasted for 11 days at 0.32 d-1 and reached a final yield of 5300 cells·ml-1. Under shaking, exponential growth at 0.39 d-1 lasted for 5 days and the final yield was 3000 cells·ml-1. Shaken stationary cells were smaller than the still ones. Toxin cell concentrations in O. cf. ovata were 4 times higher in the stationary than in the exponential phase in the two treatments. The shaken cells had a 30% lower content than the still ones, namely 22 vs. 33 pg OVTX-a·cell-1 (exponential phase) and 8.2 vs. 2.6 pg OVTX-a·cell-1 (stationary phase)
Description17th International Conference on Harmful Algae (ICHA), 9-14 October 2016, Florianópolis, Santa Catarina, Brazil.-- 1 page
Publisher version (URL)http://icha2016.com/program/#collapseOne
URIhttp://hdl.handle.net/10261/170651
Appears in Collections:(ICM) Comunicaciones congresos
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